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由日本筑波国家地球科学和预防灾难研究所的Ｔ．Ｋａｔａｙａｍａ领导的地震工作者研究了本州岛地壳断裂的演化。沿着东京以西１３０ｋｍ的骏河湾延伸的一条断裂位于菲律宾板块沉降至欧亚板块之下的俯冲带。还在２０世纪７０年代 ,日本地震学家就确定了最近３００年来发生在这
By Japan’s Tsukuba National Institute of Geosciences and Preventive Disaster Research. Earthquake workers led by Katayama studied the evolution of the crustal faults in Honshu Island. A fracture extending along Surugad Bay 130km west of Tokyo lies in the subduction zone where the Philippine Plate has subsided below the Eurasian Plate. Also in the 1970s, Japanese seismologists identified this for the last 300 years